23567521 has 2 divisors, whose sum is σ = 23567522. Its totient is φ = 23567520.

The previous prime is 23567519. The next prime is 23567567. The reversal of 23567521 is 12576532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23386896 + 180625 = 4836^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 23567521 - 2¹ = 23567519 is a prime.

Together with 23567519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23567501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11783760 + 11783761.

It is an arithmetic number, because the mean of its divisors is an integer number (11783761).

Almost surely, 2^23567521 is an apocalyptic number.

It is an amenable number.

23567521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23567521 is an equidigital number, since it uses as much as digits as its factorization.

23567521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 31.

The square root of 23567521 is about 4854.6391215002. The cubic root of 23567521 is about 286.7067828902.

The spelling of 23567521 in words is "twenty-three million, five hundred sixty-seven thousand, five hundred twenty-one".